Secret Agent "X"AdventureEspionage FictionWarPeriodical House Inc.·United States·1934–1939·41 issuesAll1934 (10)1935 (11)1936 (8)1937 (6)1938 (5)1939 (1)SE#V13N01 (1938-February)#V13N01 (1938-February)SE#V13N03 (1938-April)#V13N03 (1938-April)SE#V13N04 (1938-June)#V13N04 (1938-June)SE#V14N01 (1938-September)#V14N01 (1938-September)SE#V14N02 (1938-December)#V14N02 (1938-December)
